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Annals of Surgical Oncology, Vol 7, Issue 3 193-198, Copyright © 2000 by Society of Surgical Oncology
ARTICLES |
T. Takenoue, H. Nagawa, K. Matsuda, S. Fujii, M. E. Nita, K. Hatano, J. Kitayama, T. Tsuruo and T. Muto
Department of Surgical Oncology, University of Tokyo, Japan. takenoue-1su@h.u-tokyo.ac.jp
BACKGROUND: Thymidylate synthase (TS) is regarded as a parameter of 5-fluorouracil (5-FU) chemosensitivity for colorectal carcinoma. Recent researchers indicate that the chemosensitivity of 5-FU for colorectal carcinoma with low expression of TS is better than tumors with high expression of TS. But the relation between TS expression and overall survival of curatively resected colorectal cancer patients has been less studied. METHODS: Specimens of curatively resected colon carcinoma from 148 patients were included in this study. TS expression in the tumor was assessed by immunohistochemical staining technique, and the patients were categorized into TS-(+) and TS-(-) groups. First, the relation between TS expression and survival of patients was examined. Next, for each group, we compared survival between the chemotherapy-(+) and the chemotherapy-(-) subgroup. RESULTS: Overall survival was significantly better in the TS-(-) group (n = 107) than in the TS-(+) group (n = 41) (P = .0003). In the TS-(-) group, there was little difference between the chemotherapy-(+) and the chemotherapy-(-) subgroup. In the TS-(+) group, the survival of the chemotherapy-(+) subgroup was significantly better than the chemotherapy-(-) subgroup (P = .0439). CONCLUSIONS: TS, itself, may be a prognostic factor for colon carcinoma; and 5-FU adjuvant chemotherapy may be appropriate for colon carcinoma with high expression of TS.
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